This is an odd flash - it has been a lot of years since I've seen a truly fully manual flash. This flash is as basic as they come, there is nothing fancy about it. It is a MANUAL flash, meaning you set the power on the flash and then you'll have to figure out the f-stop based on the distance to the subject. The flash doesn't even have a distance / ISO / f-stop scale on it. You pretty much have to divine the correct settings.The flash looks like much more expensive flashes - frankly the mold is similar to the Canon 520 EX-II (replaced by the 600 EX). The parts inside this flash are nothing like anything Canon ever sold (well maybe they sold some flashes like this back in the 1960s). There is the biggest problem, a person might think this is just an inexpensive version of the Canon flash; that person would be very wrong.The attempt at looking like a Canon flash goes pretty deep. Inside the box there is a vinyl pouch in virtually the same shape as the Canon. There is a plastic cold shoe stand - mimicking the Canon stand. The flash head has a pull out clear lens for wider angle coverage, and a white card for catch light. The head and body have a similar look.Things start to look bad compared to Canon - putting in the batteries. Canon has really great waterproof seals on a hefty door for the batteries. This has a small sliding door that is somewhat difficult to close and not at all waterproof for four AA batteries not included. The head tilts freely with slight click stops at major angles. On the Canon two buttons have to be pressed to release the head. There is a round PC cord socket behind a rubbery flap. On the Canon there are two different sockets behind a truly waterproof flap.The display screen is slightly smaller on the K&F. Button pressing is not very intuitive. The Mode button switches between Manual, Slave (S1 and S2), and Multi-flash. There is a zoom adjustment.The display is incredibly basic. In manual mode, adjust the power in fractions. Along with the word Manual, and the mm zoom setting; that's it. Nothing more. The flash really needs an ISO setting and f-stop / distance scale. In order to use this flash, you have to do some crazy mental exercise with a manual flash calculator; or just shoot a bunch of test pictures until you get the exposure right. There's no other way to get this right.In Slave mode, you'll need a master flash (this cannot serve as a master flash) - one of those expensive Canon flashes. One mode ignores the preflash a lot of automatic flashes use to get the settings all aligned correctly.Multi-Flash worked in test mode. I could not get it to do multiple fires when connected to a camera.Now a person could say, professional strobe lights are fully manual - they just have a power dial on them; and professionals use them every day. Well, they also set those up in studios, and they usually have a flash meter to get the exposure right. And they are way higher powered with modeling lights.If you have a need for a completely manual flash, this is pretty good. It is powerful and recycles very quickly. It can be used wirelessly with a master flash. I wish it didn't try to look like something it isn't.A free sample was provided for review.